🚀 Speed Converter
Convert between miles per hour, kilometers per hour, knots, meters per second and feet per second. Useful for driving abroad, aviation, sailing and physics, 1 mph = 1.60934 km/h exactly.
1 m/s = 3.6 km/h
1 meters per second = 3.6 kilometers per hour
1 × 3.6 = 3.6
1 m/s equals 3.6 km/h, so multiplying by 3.6 converts the value. The result describes the exact same quantity, only the measuring stick changes.
Popular speed conversions
- Miles per hour to Kilometers per hour (mph → km/h)
- Kilometers per hour to Miles per hour (km/h → mph)
- Knots to Miles per hour (kn → mph)
- Miles per hour to Knots (mph → kn)
- Knots to Kilometers per hour (kn → km/h)
- Kilometers per hour to Knots (km/h → kn)
- Meters per second to Kilometers per hour (m/s → km/h)
- Kilometers per hour to Meters per second (km/h → m/s)
- Meters per second to Miles per hour (m/s → mph)
From the blog
All speed units
| Unit | Symbol | Definition |
|---|---|---|
| Meter per second | m/s | Meters per second (m/s) is the SI unit of speed. Physics calculations and wind speeds in scientific contexts use m/s; 1 m/s equals exactly 3.6 km/h. |
| Kilometer per hour | km/h | Kilometers per hour (km/h) is the standard road-speed unit in most countries. 100 km/h equals 62.14 mph or 27.78 m/s. |
| Mile per hour | mph | Miles per hour (mph) is the road-speed unit of the United States and United Kingdom. 1 mph is exactly 1.609344 km/h. |
| Knot | kn | A knot (kn) is one nautical mile per hour, exactly 1.852 km/h. Aircraft, ships and wind speeds in meteorology are measured in knots. |
| Foot per second | ft/s | Feet per second (ft/s) is a US customary speed unit, exactly 0.3048 m/s. Projectile velocities and some engineering specs use ft/s. |
| Mach (sea level) | Ma | Mach number expresses speed relative to the speed of sound, Mach 1 ≈ 340.29 m/s (1,225 km/h) at sea level and 15 °C. The true value varies with altitude and temperature. |
Frequently asked questions
How do I convert speed units?
Choose your two units in the converter above and type a value, the result updates instantly, entirely in your browser. All 6 speed units on this page are interchangeable, so you can convert in either direction.
Which speed units can I convert here?
This converter supports 6 speed units: Meter per second (m/s), Kilometer per hour (km/h), Mile per hour (mph), Knot (kn) and 2 more. Pick any two to convert between them.
What is the most common speed conversion?
One of the most-used speed conversions is Miles per hour to Kilometers per hour (mph → km/h). Every speed pair we support is linked below, each with its own formula and table.
Is this Speed Converter free and private?
Yes. It is free with no sign-up, uses the exact internationally defined conversion factors, and computes every result locally in your browser, nothing you type is uploaded, and the page keeps working offline.